The Growl Project has released Growl 2.0, a major update for the system-wide notification utility that brings compatibility with Notification Center in OS X 10.8 Mountain Lion. With this new release, you can set Growl to route all of its notifications through Notification Center (rather than use Growl’s standalone pop-up notifications). However, you’ll still find some apps (including Dropbox) using Growl’s notification system instead of forwarding to Notification Center due to the requirement that developers update their apps to the Growl 2.0 API. The update also adds support for Prowl and Boxcar, two utilities that enable you to receive notifications from your Mac on your iOS device. It also reportedly resolves the high CPU spikes and multiple crashes suffered by the previous version. ($3.99 new from the Mac App Store, free upgrade from previous Mac App Store versions, 6.1 MB)
Option-click to Hide Apps Quickly
This trick has been available in the Mac OS for years, but many people still don't know it. If you have too many windows cluttering up your screen, you can hide specific ones easily as you work. When you're in any application, hold down the Option key and click on another app's window, on the Dock, or in the Finder to switch to that other app and simultaneously hide all the windows in the previously current app.